CVE-2021-20263 Information

Description

A flaw was found in the virtio-fs shared file system daemon (virtiofsd) of QEMU. The new ‘xattrmap’ option may cause the ‘security.capability’ xattr in the guest to not drop on file write potentially leading to a modified privileged executable in the guest. In rare circumstances this flaw could be used by a malicious user to elevate their privileges within the guest.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

Reference

https://www.openwall.com/lists/oss-security/2021/03/08/1 https://bugzilla.redhat.com/show_bug.cgi?id=1933668 https://security.netapp.com/advisory/ntap-20210507-0002/

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

LOW

Base Score

NONE

Base Severity

3.3